How to make Image Texture have white background and/or transparent background with a second white material behind it on the same object?
This answer helped me the most: Change color of PNG background (transparent to color)

Particularly using the MixRBG for Nodes (which btw are in 'Shader' window, not 'Nodes' window) 

I copied the MixRBG part of this guy's setup. https://i.stack.imgur.com/kZOHk.jpg

Thanks all!